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85 lines
2.8 KiB
Markdown
85 lines
2.8 KiB
Markdown
# Haskell Urbit API
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[![License MIT](https://img.shields.io/badge/license-MIT-brightgreen.svg)](https://opensource.org/licenses/MIT)
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[![Hackage](https://img.shields.io/hackage/v/urbit-api.svg?style=flat)](https://hackage.haskell.org/package/urbit-api)
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[![builds.sr.ht status](https://builds.sr.ht/~ben/urbit-api.svg)](https://builds.sr.ht/~ben/urbit-api?)
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[![awesome urbit badge](https://img.shields.io/badge/~-awesome%20urbit-lightgrey)](https://github.com/urbit/awesome-urbit)
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This library helps you talk to your Urbit from Haskell, via HTTP.
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The Urbit API is a command-query API that lets you hook into apps running on
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your Urbit. You can submit commands (called "pokes") and subscribe to
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responses.
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See the `test.hs` file for some example usages.
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## Design
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The Urbit vane `eyre` is responsible for defining the API interface. The path to
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the API is `/~/channel/...`, where we send messages to the global log (called
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`poke`s) which are then dispatched to the appropriate apps. To receive
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responses, we stream messages from a path associated with the app, such as
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`/mailbox/~/~zod/mc`. Internally, I believe Urbit calls these `wire`s.
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`urbit-api` handles most of the path, session, and HTTP request stuff
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automatically. See the
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[haddocks](https://hackage.haskell.org/package/urbit-api/docs/Urbit-API.html)
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for more details.
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This library is built on req, conduit, and aeson, all of which are very stable
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and usable libraries for working with HTTP requests and web data.
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## Example usage
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```haskell
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import qualified Data.Aeson as Aeson
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import Data.Aeson ((.=))
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import qualified Data.Text as Text
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import qualified Data.UUID.V4 as UUID
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import Urbit.API
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main :: IO ()
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main = do
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let fakezod = Ship
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{ uid = "0123456789abcdef",
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name = "zod",
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lastEventId = 1,
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url = "http://localhost:8081",
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code = "lidlut-tabwed-pillex-ridrup"
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}
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-- Establish connection
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sess <- connect ship
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-- Send a message by poking the chat-hook
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uuid <- UUID.nextRandom
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poke sess ship "zod" "chat-hook" "json" $
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Aeson.object
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[ "message"
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.= Aeson.object
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[ "path" .= Text.pack "/~/~zod/mc",
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"envelope"
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.= Aeson.object
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[ "uid" .= UUID.toText uuid,
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"number" .= (1 :: Int),
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"author" .= Text.pack "~zod",
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"when" .= (1602118786225 :: Int),
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"letter" .= Aeson.object ["text" .= Text.pack "hello world from haskell!"]
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]
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]
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]
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```
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## TODO
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- fix test suite on travis (OOM when trying to compile urbit)
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- more sophisticated test cases, also use cabal test instead of homegrown thing
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- add an exe that wraps the library with a cli
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- port to ghcjs
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- put some examples in the docs
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- graph store interface
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- additional agent interfaces
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